Wow. From what you said, it seems that you don't have much compassion for others and their struggles. Remember, not everyone is like you. Just because you do fine with working full time, taking care of a dog and getting your phd doesn't mean that everyone can handle that kind of intensity. It's a bit cruel to have the "be thankkful for what you have" attitude because the translation that people actually hear is "you have no right to complain because others have it worse". This is extremely hurtful. I'm sorry that your own mental health issues haven't taught you to be compassionate for others. I know it's hard to listen to others complain all of the time, but the suck it up, buttercup sort of response isn't always helpful. Tough love can be helpful, but it has to come out of genuine care for the person and not just a wish for them to shut up and automatically be happy so you don't have to deal with them anymore.